Phonograph-record mold.



NITED STATES PATENT OFFICE.

EDWARD L. AIKEN, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO NEW JERSEY -IPATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PHONOGRAPH-RECORD MOLD.

Specification of Letters Patent.

Application filed October 12, 1905. Serial No. 282,365.

To all whom it may concern:

Be it'known that I, EpwARn L. AIKEN, a citizen of the United States, residing at East Oran e,-in the county of Essex and State-of New ersey, have invented certain new and useful Improvements in Phonograph-Record- Molds, of which'the following is a descrip tion.

-My invention relates to the moldin of phonograph records and more particu arly to a moldlng process wherein a tubular mold is caused 'to descend into a bath of molten material which fills the mold,'a coating of which congeals on the interior surface thereof and adheres to the same when the mold is removed from the bath, after which "the bore of the congealed materialis reamed out before it hardens.

a article.

hardened.

' My invention has for its object the provision of a mold which shall be capable of molding the lower end of a record into fin:

ished form; which will be strong mechanically in order that it ma not be injured by rough handling exten ing over a long period of time; and more particularly that ,the interior or hereof the mold should be ganying drawing which shows in longitu.-'

protected against injury by the reaming knife or by handling.

With these ends in view my invention consists in the features hereinafter described and claimed.

Reference is hereby made to the accominal. section amold constructed ance with my invention. a

The mold comprises a hollow cylinder 1 which carries upon its bore a negative representation of a sound record. This may be in accordj obtained in any welljknownmanner as for I instance by depositing upon a master record a metallic coating, as described in U. S. Patent No. 713,863 to Thomas A Edison, and

Any 'wax adhering t set forth.

. afterward electro-plating uponsaid coating a shell of any suitable metal such as copper. This shell may be strengthened and pro 'tected by shrinking upon the same a brass cylinder 2. v The upper end of this cylinder projects beyond the shell 1 thereby protect mg the same. The lower end of the shell 1 extends inward anddownward as shown,

whereby a conical or beveled surface 3 is.

formed terminating in a central aperture 4. Thls surface 3 merges into the vertical portion of the shell 1 by a gentle curve 3 and reaches the openin 4 by a similar curve4 extending toward t e horizontal, so that the lower end of the'molded article will be rounded off by reason of the curve 4, and

the molten wax as it slowly enters the mold.

through the o ening 4 will drive the airbefore it and wi l not entrap any of the airas would be the case if sharp, curves. or angles Patented May 3, 1910.-

were present. Between the inclined portion a 3' of the shell and the cylinder-2 is a s ace which is filled with soft metal 5 such as end. .The lower end of the mold is finished by securing thereto a ring 6 having an opening7 which coincides with the opening 4. The

ring may be of steel and secured to the cylinder 2 by screws 8. This ring covers .the inclined portion 3 of the shell 1 and pro tects it against injury. It enables one to ream the congealed material alon the line. a, a since the ring.6 will protect the shell 1 against injury by the reaming knife. The

lower end of the record will therefore be in its finished condition at the time it isremoved from the mold.

In practice, the reaming knife passes very.

close to the bore of the'rlng 6, but does not ordinarily touch the same, the amount of clearance being exa gerated in the drawing. %1616l30 after the reaming operation may be easily wiped out before it hardens by the finger. bore of the rin is' rounded; as at 9, so that it is not easily ented and the formation of air bubbles is prevented. Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A tubular mold having an inwardly extending lower. portion surrounding an aperture, said portion merging into the main portion by a gentle curve, substantially as 2. 'A tubular inold'having a lower taper- The lower end of the the horizontal as it reaches the ing ortion extending inward and downwar and terminating in a central opening, said tapering portion merging into the main portionby a gentle curve, substantially as set forth.

'3. A tubular mold having a lower tapering' ortion extending inward and down- War and terminating in a central opening, said tapering portion gently: curving toward 4 opening, substantially as set forth. 4. A tubular mold comprising an inner cylindrical shell extending inward at its lower end, a cylindrical backing surrounding said shell and a ring covering the bottom of sand shell, substantially as set forth.

5. A tubular mold comprising an inner cylindrical shell, extending inward and downward at' its lower end, a cylindrical backing surrounding said shell and a ring covering .6. A tubular mold comprising an inner cylindrical shell of electro-deposited metal of substantially uniform thickness and extending inward at its lower end, a cylindrical backing surrounding saidshell and a ring covering the bottom of said shell, substantially as set forth.

7. A tubular mold comprising an inner cylindrical shell, a cylindrical backing surrounding said shell and extending beyond the same at its upper end and a ring covering the bottom of said shell, substantially as set forth. p

8. A tubular mold comprising an inner cylindrical shell extending inward and downward at its lower end, a cylindrical backing surrounding said shell, a filler bethe bottom of said shell, substa'n- ,tially as set forth.

tween the backing and the inwardly extend ing portion of the shell and a ring covering backing surrounding said shell, a soft metalfiller between the backing and inwardly extending portion of the shell, and a ring covering the bottom of said shell, substantially asset forth.

. 10. A tubular mold comprising an inner I cylindrical shellv extending inw ard at its lower end, a cylindrical backing surrounding said shell and a ring covering the bottom of said shell, said ring fitting closely 7 against the bottom of the shell and having the same internal diameter as thesmallest portion thereof, substantially as set forth.

11. A tubular mold comprising an inner cylindrical shell extending. inward at its lower end, a cylindrical backing surround ing said shell, and a ring covering the bottom of the shell, the lower edge of the bore of said ring being rounded off, substantially as set fort 12. A tubular mold comprising an inner cylindrical shell extending inwardly at one end, a cylindrical backing surrounding said shell and a ring covering the bottom of said shell and secured to the backing, substantlally as set forth.

This specification signed and witnessed this 28th day of September, 1905.

EDWARD L. AIKEN;

Witnesses:

DELOS HoLnEN, FRANK L. DYER. 

